Strong's #7461: ra`ad (pronounced rah'-ad)
 or (feminine) radah {reh-aw-daw'}; from 7460; a shudder:--trembling.
Brown-Driver-Briggs Hebrew Lexicon:
 / 
  ra‛ad / re‛âdâh 
 
 1) trembling, fear
 
  Part of Speech: noun masculine or feminine
Relation: from H7460
  Same Word by TWOT Number:  2184a, 2184b
Usage:
This word is used 5 times:
Exodus 15:15: "shall be amazed; the mighty men of Moab,  trembling shall take hold upon them; all the inhabitants of Canaan"
Psalms 2:11: "the LORD with fear, and rejoice  with trembling."
Psalms 48:6: " Fear took hold upon them there, and pain, as of a woman in travail."
Psalms 55:5: "Fearfulness  and trembling are come upon me, and horror hath overwhelmed"
Isaiah 33:14: "The sinners in Zion are afraid;  fearfulness hath surprised the hypocrites. Who among us shall dwell"